Electric switch.



J. G; SMITH.

ELECTRIC SWITCH.

APPLICATION FILED JULY 31, 1911.

1,123,413. Patented Jan.5, 1915.

2 SHEETSSHEBT 1.

WITNESSES: INVENTOH ATTORNEY.

I THE NORRIS PETERS CO.. FHOTD'LITHO" WASHINGTON, D. C.

J. C. SMITH.

ELECTRIC SWITCH.

APPLIGATIOH FILED JULY 31, 1911.

1,123,413, Patented Jan. 5, 1315.

2 SHEETS-SHEET 2.

f ATTORNEY.

FIFE NORRIS PETERS 60.. PHOTO LITHO. WASHINGTON, 0, c

UNITED STATES PATENT oiuuon.

JOHN 0. SMITH, OF LOUISVILLE, KENTUCKY.

ELECTRIC SWITCH.

Application filed July 31, 1911.

To all whomz't may concern Be it known that 1, JOHN 0. SMITH, a citizen of the United States, residing at Louisville. in the county of Jefferson and State of Iientuclry, have invented a new and useful Improvement in Electric Switches of which the following is a specification.

This invention relates to electric switches, and has for an object the provision of a switch adapted to be used on an elevator in connection with means whereby the maximum speed of the elevator may be reduced at a predetermined point, and can not again be attained, in the same direction, although it may be in the opposite direction, until the elevator has been reversed and has repassed the given point although it may be used for other purposes.

lVith the foregoing, and other objects in view, the invention consists of the novel construction and arrangement of parts to be hereinafter referred to and illustrated in the accompanying drawings, which form a part of this specification, in which is shown an embodiment of the invention, but it is to be understood that changes, variations and modifications may be resorted to that come within the scope of the appended claims.

In the drawings, in which similar reference numerals indicate like parts in the clifferent views;-Figure 1, is a side elevation of an elevator to which my safety appliance is attached. Fig. 2, is a front elevation of the switch. Fig. 3 a side elevation of the same. Fig. l, a. plan of the switch, with the cover removed. Fig. 5, a bottom view, with the operating arm and cover removed. Fig. 6, a side elevation of the operating arm. Fig. 7, is a detail, in perspective, showing the contact shoe in place on the operating arm.

Referring to the drawings, 1 indicates a case, provided near its lower edge with a rearwardly projecting flange, 2, that adapts it to be secured to the lower portion of an elevator car, as illustrated in Fig. 1. On top of the case is a boss, 3, in which is a bearing, 1. An arm, 5, provided with a stub shaft, 6, adapted to fit in the bearing 4: extends down over the face of the case, and is provided at its lower end with a boss, 7. From the inner end of the boss 7 an arm, 8, extends upward, parallel with the arm 5, and is provided with an extension 9, of insulating material, such as fiber, adapted to extend within the case. A contact shoe, 10,

Specification of Letters Patent.

Patented Jan. 5, 1915.

Serial No. 541,591.

having upturned edges, 11, and a central pin, 12, is adapted to fit loosely on the extension 9; the pin 1 fitting ina perforation l3, and preventing longitudinal movement of the shoe. A. plate, or base, 1a, of insulating material is mounted within the case near the lower end thereof. On the base are secured contact plates 15 and 16, provided with binding posts 17 and 18. A contact bar, 19, mounted longitudinally of the base, over the contact plates, has a spring, 21, secured centrally thereof. The bar and the spring are held in position by the posts, 20. Nuts, on the posts 20 serve to regulate the tension of the spring. The contact shoe 10 is adapted to slide between the contact plates and the bar 19, the spring maintaining a constant pressure between them, as shown in Fig. 5. On the lower end of the arm 5 a roller, 23, is mounted. Electrical conductors are led into the case through openings, 24-, on each side. The normal position of the arm 5 is v rtical, in this position the contact shoe bridges the contact plates 15 and 16, and current entering by either will pass through the shoe and out by the bar 19.

To the elevator stanchion, 26, guides, 27 and 28, are secured at predetermined dis tances from a given point, usually the top and bottom. The guides are formed with side walls, 29 attached to bars, 30, that are fastened on the stanchion 26. The side walls 29 are spaced apart to form a passage for roller 23. The ends of the passages toward the elevator car being so positioned as to allow the roller to enter when the arm 5 is in the normal, or vertical, position. The passages in the upper and lower guides are inclined in opposite directions from a vertical line through the entrance thereto, in order to shift the arm to one side or the other according to the direction of travel. The shifting of the arm in either direction breaking contact between the corresponding contact and the shoe. The switch is con nected up in circuit as described in my copending application No. 611,590 filed July 31, 1911. As the elevator goes up the roller 23 will enter the passage in guide 27 and be deflected to the left moving the contact shoe 0d of contact plate 16, current can not then pass by that path, though it can still. pass by way of contact 15, shoe 10 and bar 19. When the elevator is reversed, as it goes down, the roller 23 will again enter the passage in the guide 27 and be moved to a central position, and current may pass by either plate through the shoe to bar 19.'

hen the elevator reaches the guide 28 the roller will enter the passage therein and the arm will be deflected to the right, and contact with contact 15 will be broken. It will be observed that current may be delivered over either path between the points where the'guides are located but over only one path above or below the guides. Stops, 31, faced with rubber blocks, 32, are located on the face of the case to limit the travel of the arm 5. The roller 23 is provided with tire 33, of rubber to absorb shock and render .the action noiseless.

I have illustrated my improved switcl appliedto an elevator as a safety device, it is evident however that it may be found serviceable in other ways, and that it may be operated manually or by other suitable means.

Having described my invention so that any one skilled in the art pertaining thereto may make and use the same I claim 1. In a device of the class described, a case, an arm pivoted on and overhanging said case, a return on said arm extending within the case, a pair of contact plates in endwise alinement within thecase, a spring pressed contact bar spaced above said plates,

a contact shoe on the end of said return and adapted to slide between said bar and said plates.

2. In a device of the class described, a case, an arm pivoted on the face of the case and overhanging the lower edge thereof, a return on said arm having an extension of nonconducting material entering said case, a pair of contact plates in endwise alinenient within the case, a contact shoe car.-

ried by said extension and adapted to bear on said plates and a spring pressed contact bar bearing on said shoe.

In a device of the character described, a case, an arm pivoted on the exterior of the case and overhanging the lower edge thereof, a return on said arm having an insulated extension entering the case, said extension having a perforation nearthe inner end thereof, a contact shoe with upturned edges and a centrally located pin loosely positioned on the end of said extension with said pin in said perforation, a pair of con tact plates within the case, a spring pressed contact bar spaced above said plates, said shoe adapted to travel between said bar and said plates.

JOHN C. SMITH. 1 Witnesses WM. J. SAUER, W. B. MUNNELL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. 0. 

